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CVE-2026-27878

Tempo TraceQL query with exemplar hint could result in unbounded memory usage

MEDIUM
6.5
CVSS Score
Published: June 19, 2026 at 07:02 PM UTC
Updated: July 1, 2026 at 11:22 PM UTC
2 products affected across 1 vendorTempoEnterprise Traces

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

A TraceQL query in Grafana Tempo with a large exemplars hint value can cause the Tempo instance to allocate an excessive amount of memory, resulting in an out-of-memory crash. This could allow an authenticated user to trigger a denial of service against the Tempo service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tempo· Grafanagrafana-plugin
95%
2.10.0 ≤ v < 2.10.22.6.0 ≤ v < 2.10.22.6.0 ≤ v < 2.8.42.9.0 ≤ v < 2.9.22.6.0
Affected range stops below 2.10.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.8.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.9.2, so it looks safe — our inference, not a vendor statement
Enterprise Traces· Grafanagrafana-plugin
60%
2.6.1 ≤ v < 2.8.82.6.1
Affected range stops below 2.8.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryBroken Link
Source: cverecord
https://grafana.com/security/security-advisories/cve-2026-27878

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMGRAFANA
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400

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